Inspired by the United States Bullion Depository in Fort Knox, Kentucky, these polarized sunglasses embody timeless style and strength with a durable, form-fitting design. Knockaround Fort Knocks are made with injection-molded frames featuring recessed gold bars, plus gold logo detailing and hidden spring hinges. We've dressed this comfortable pair in a timeless palette of glossy black and tortoise shell fade frames with polarized amber lenses. Polarized amber lenses Full UV400 eye protection Black and tortoise shell fade frames Glossy finish Gold hardware Metal spring hinges Microfiber lens cleaning pouch included FDA compliant impact resistant lenses